The night starts off with a rare solo and acoustic set from Bob Weir, who seizes the moment and offers both interesting versions of Weir staples — “Music Never Stopped” and “Easy To Slip” were standouts — and beloved Garcia material. Warren Haynes and Grace Potter join for Potter’s first ever performance of tunes from the Grateful Dead songbook (seemed like a pro) at the end of the set before an unexpected and joyous version of “Jailhouse Rock”. Stones sax-man Bobby Keys joined in for “Bird Song” and “Jailhouse” and stuck around for a tweener set, which included a run-down of the Jagger-Richards ballad “Wild Horses”.

For jam fans, The Roots take the prize for hip-hop group most likely to crossover and its clear from this set why. Funky rhythms and filthy playing all around — I’d like to see them on more festival bills by next summer. But the real coup here is the encore jam: Phish guitarist Trey Anastasio leads the band through two Phish classics and a run through of “Pigtail” from his forthcoming release Traveler. Then, the ghosts of the Capitol are all channeled for a closing trio of tunes that make ample use of all the night’s talent.